The Current Population Survey (CPS) is a household sample survey conducted monthly by the Census Bureau to provide estimates of employment, unemployment, and other characteristics of the general labor force, estimates of the population as a whole, and estimates of various subgroups in the population. The entire noninstitutionalized civilian population of the United States is sampled to obtain the respondents used for this survey. The May files contain the core questions included in every CPS as well as an additional series of questions concentrating on one of three topics: adult education, pension and retirement plan coverage, or multiple job holding and premium pay. Users should note that some of the May files possess subtitles. This reflects a shift in Census Bureau policy toward the assignment of more explicit titles to the various CPS surveys. Also, starting with the 1984 data, the survey universe was expanded to include all male members of the armed forces living in civilian housing units. A major redesign of the Current Population Survey was implemented in January 1994. The primary aim of the redesign was to improve the quality of the data derived from the survey by introducing a new questionnaire and modernized data collection methods.